Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A3919A found under Cup Tapered Roller Bearing by Stewart Precision Corp. The National Stock Number assigned to this part is 3110012703715, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A3919A.